I am seeing something similar with  Intel(R) Centrino(R) Advanced-N 6230, the 
wireless connection drops, sometimes does not reconnect, sometimes it does.
I have disabled 11n per other posts and it seems to be helping, no disconnects 
since disabling.
$  more /etc/modprobe.d/iwlwifi.conf
options iwlwifi 11n_disable=1

This issue arose for me when I picked up the final two weeks worth of
updates for 12.04.

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https://bugs.launchpad.net/bugs/984552

Title:
  iwlwifi intermittently losing connectivity

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